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  <title>Open Internet or Unix domain socket connection</title>

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  <h1 class="refname">stream_socket_client</h1>
  <p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">stream_socket_client</span> &mdash; <span class="dc-title">Open Internet or Unix domain socket connection</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.stream-socket-client-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">resource</span> <span class="methodname"><strong>stream_socket_client</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$remote_socket</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$errno</code></span>
   [, <span class="methodparam"><span class="type">string</span> <code class="parameter reference">&$errstr</code></span>
   [, <span class="methodparam"><span class="type">float</span> <code class="parameter">$timeout</code><span class="initializer"> = ini_get(&quot;default_socket_timeout&quot;)</span></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code><span class="initializer"> = STREAM_CLIENT_CONNECT</span></span>
   [, <span class="methodparam"><span class="type">resource</span> <code class="parameter">$context</code></span>
  ]]]]] )</div>

  <p class="para rdfs-comment">
   Initiates a stream or datagram connection to the destination specified
   by <em><code class="parameter">remote_socket</code></em>.  The type of socket created
   is determined by the transport specified using standard URL formatting:
   <em>transport://target</em>.  For Internet Domain sockets
   (AF_INET) such as TCP and UDP, the <em>target</em> portion
   of the <em><code class="parameter">remote_socket</code></em> parameter should consist of
   a hostname or IP address followed by a colon and a port number.  For Unix
   domain sockets, the <em><code class="parameter">target</code></em> portion should point
   to the socket file on the filesystem.
  </p>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    The stream will by default be opened in blocking mode.  You can
    switch it to non-blocking mode by using
    <span class="function"><a href="function.stream-set-blocking.html" class="function">stream_set_blocking()</a></span>.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.stream-socket-client-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">remote_socket</code></em></dt>

     <dd>

      <p class="para">
       Address to the socket to connect to.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">errno</code></em></dt>

     <dd>

      <p class="para">
       Will be set to the system level error number if connection fails.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">errstr</code></em></dt>

     <dd>

      <p class="para">
       Will be set to the system level error message if the connection fails.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">timeout</code></em></dt>

     <dd>

      <p class="para">
       Number of seconds until the <em>connect()</em> system call
       should timeout.
       <blockquote class="note"><p><strong class="note">Note</strong>: 
        <span class="simpara">
         This parameter only applies when not making asynchronous
         connection attempts.
        </span>
       </p></blockquote>
       <blockquote class="note"><p><strong class="note">Note</strong>: 
        <p class="para">
         To set a timeout for reading/writing data over the socket, use the
         <span class="function"><a href="function.stream-set-timeout.html" class="function">stream_set_timeout()</a></span>, as the
         <em><code class="parameter">timeout</code></em> only applies while making connecting
         the socket.
        </p>
       </p></blockquote>
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">flags</code></em></dt>

     <dd>

      <p class="para">
       Bitmask field which may be set to any combination of connection flags.
       Currently the select of connection flags is limited to
       <strong><code>STREAM_CLIENT_CONNECT</code></strong> (default),
       <strong><code>STREAM_CLIENT_ASYNC_CONNECT</code></strong> and
       <strong><code>STREAM_CLIENT_PERSISTENT</code></strong>.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">context</code></em></dt>

     <dd>

      <p class="para">
       A valid context resource created with <span class="function"><a href="function.stream-context-create.html" class="function">stream_context_create()</a></span>.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.stream-socket-client-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   On success a stream resource is returned which may
   be used together with the other file functions (such as
   <span class="function"><a href="function.fgets.html" class="function">fgets()</a></span>, <span class="function"><a href="function.fgetss.html" class="function">fgetss()</a></span>,
   <span class="function"><a href="function.fwrite.html" class="function">fwrite()</a></span>, <span class="function"><a href="function.fclose.html" class="function">fclose()</a></span>, and
   <span class="function"><a href="function.feof.html" class="function">feof()</a></span>), <strong><code>FALSE</code></strong> on failure.
  </p>
 </div>

 
 <div class="refsect1 errors" id="refsect1-function.stream-socket-client-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   On failure the <em><code class="parameter">errno</code></em> and
   <em><code class="parameter">errstr</code></em> arguments will be populated with the actual
   system level error that occurred in the system-level
   <em>connect()</em> call. If the value returned in
   <em><code class="parameter">errno</code></em> is <em>0</em> and the
   function returned <strong><code>FALSE</code></strong>, it is an indication that the error
   occurred before the <em>connect()</em> call. This is
   most likely due to a problem initializing the socket. Note that
   the <em><code class="parameter">errno</code></em> and
   <em><code class="parameter">errstr</code></em> arguments will always be passed by
   reference.
  </p>
 </div>

 
 
 <div class="refsect1 examples" id="refsect1-function.stream-socket-client-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="stream-socket-client.example.basic">
    <p><strong>Example #1 <span class="function"><strong>stream_socket_client()</strong></span> example</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$fp&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">stream_socket_client</span><span style="color: #007700">(</span><span style="color: #DD0000">"tcp://www.example.com:80"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$errno</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$errstr</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">30</span><span style="color: #007700">);<br />if&nbsp;(!</span><span style="color: #0000BB">$fp</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"</span><span style="color: #0000BB">$errstr</span><span style="color: #DD0000">&nbsp;(</span><span style="color: #0000BB">$errno</span><span style="color: #DD0000">)&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"GET&nbsp;/&nbsp;HTTP/1.0\r\nHost:&nbsp;www.example.com\r\nAccept:&nbsp;*/*\r\n\r\n"</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;while&nbsp;(!</span><span style="color: #0000BB">feof</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">))&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">fgets</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">1024</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
   <div class="example" id="stream-socket-client.example.daytime">
    <p><strong>Example #2 Using UDP connection</strong></p>
    <div class="example-contents"><p>
     Retrieving the day and time from the UDP service &quot;daytime&quot; (port 13)
     on localhost.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$fp&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">stream_socket_client</span><span style="color: #007700">(</span><span style="color: #DD0000">"udp://127.0.0.1:13"</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$errno</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$errstr</span><span style="color: #007700">);<br />if&nbsp;(!</span><span style="color: #0000BB">$fp</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">"ERROR:&nbsp;</span><span style="color: #0000BB">$errno</span><span style="color: #DD0000">&nbsp;-&nbsp;</span><span style="color: #0000BB">$errstr</span><span style="color: #DD0000">&lt;br&nbsp;/&gt;\n"</span><span style="color: #007700">;<br />}&nbsp;else&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">fwrite</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #0000BB">fread</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">26</span><span style="color: #007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">fclose</span><span style="color: #007700">(</span><span style="color: #0000BB">$fp</span><span style="color: #007700">);<br />}<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.stream-socket-client-notes">
  <h3 class="title">注释</h3>
  <div class="warning"><strong class="warning">Warning</strong>
   <p class="simpara">
     UDP sockets will sometimes appear to have opened without an error,
     even if the remote host is unreachable.  The error will only
     become apparent when you read or write data to/from the socket.
     The reason for this is because UDP is a &quot;connectionless&quot; protocol,
     which means that the operating system does not try to establish
     a link for the socket until it actually needs to send or receive data.
   </p>
  </div>
  <blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">当指定数值型的 IPv6
地址（例如 <em>fe80::1</em>）时必须用方括号将 IP 围起来——例如，
<em>tcp://[fe80::1]:80</em>。</span></p></blockquote>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    Depending on the environment, the Unix domain or the optional
    connect timeout may not be available.  A list of available
    transports can be retrieved using <span class="function"><a href="function.stream-get-transports.html" class="function">stream_get_transports()</a></span>.
    See <a href="transports.html" class="xref">所支持的套接字传输器（Socket Transports）列表</a> for a list of built in transports.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.stream-socket-client-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.stream-socket-server.html" class="function" rel="rdfs-seeAlso">stream_socket_server()</a> - Create an Internet or Unix domain server socket</span></li>
    <li class="member"><span class="function"><a href="function.stream-set-blocking.html" class="function" rel="rdfs-seeAlso">stream_set_blocking()</a> - Set blocking/non-blocking mode on a stream</span></li>
    <li class="member"><span class="function"><a href="function.stream-set-timeout.html" class="function" rel="rdfs-seeAlso">stream_set_timeout()</a> - Set timeout period on a stream</span></li>
    <li class="member"><span class="function"><a href="function.stream-select.html" class="function" rel="rdfs-seeAlso">stream_select()</a> - Runs the equivalent of the select() system call on the given
   arrays of streams with a timeout specified by tv_sec and tv_usec</span></li>
    <li class="member"><span class="function"><a href="function.fgets.html" class="function" rel="rdfs-seeAlso">fgets()</a> - 从文件指针中读取一行</span></li>
    <li class="member"><span class="function"><a href="function.fgetss.html" class="function" rel="rdfs-seeAlso">fgetss()</a> - 从文件指针中读取一行并过滤掉 HTML 标记</span></li>
    <li class="member"><span class="function"><a href="function.fwrite.html" class="function" rel="rdfs-seeAlso">fwrite()</a> - 写入文件（可安全用于二进制文件）</span></li>
    <li class="member"><span class="function"><a href="function.fclose.html" class="function" rel="rdfs-seeAlso">fclose()</a> - 关闭一个已打开的文件指针</span></li>
    <li class="member"><span class="function"><a href="function.feof.html" class="function" rel="rdfs-seeAlso">feof()</a> - 测试文件指针是否到了文件结束的位置</span></li>
    <li class="member"><a href="ref.curl.html" class="xref">cURL 函数</a></li>
   </ul>
  </p>
 </div>


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